SPOILER WARNING: The following article contains spoilers for Deathstroke Returns, the November 9 episode of Arrow: Season 6.
The CW has released a promo for next week's episode of Arrow, and it makes one thing abundantly clear: Deathstroke's son is a force to be reckoned with.
On last night's episode, Oliver and Slade went on a rescue mission, attempting to save the mercenary's son, Joe, from a life sentence in prison. Well, they found Joe, who escaped incarceration thanks to the help of a new (and evil) mysterious group he's leading, called "The Jackels."
In the promo, Oliver and Slade discover just how dangerous Joe is -- and we're left to wonder whether he'll be able to bring Slade back to the dark side with his Jackels, or if he'll side with Oliver.
Take a look at the "Promises Kept" promo below.
Arrow airs Thursdays at 9 p.m. ET/PT on The CW and stars Stephen Amell as Oliver Queen, David Ramsey as John Diggle, Willa Holland as Thea Queen, Emily Bett Rickards as Felicity Smoak, Echo Kellum as Curtis Holt, Rick Gonzalez as Rene Ramirez, Juliana Harkavy as Dinah Drake, Katie Cassidy as Laurel Lance and Paul Blackthorne as Quentin Lance.